After a reboot, GRUB shows up correctly. But on selecting Debian, all output to the monitor ceases, and the PC is no longer recognized as an HDMI source. When I select the recovery mode option in GRUB I do see the standard boot process text, with output ceasing immediately at the end of it. The PC at this point seems to still be powered up, but as well as outputting nothing it does not show up on my router or respond to ping. My initial guess would be something to do with using the processor's on-chip graphics, but I could be way off.
Here's an image of the last thing shown before output stops when I boot in safe mode: https://imgur.com/a/xrgrjhx. The bits of garbled text are because it's a frame from a video as I didn't know how else to capture it.
I'm aware I'm not really giving enough info to help debug this - my first issue is just with getting that information without a working system. Any suggestions or ways I can get find out more would be greatly appreciated!
EDIT: Added
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nomodeset